The following two demos are (or at least were) almost identical: demo/nls/nonlinearpoisson demo/pde/nonlinear-poisson
The first of these (which uses NewtonSolver directly) does not add much. In particular, the class MyNonlinearProblem does exactly the same thing as the class VariationalProblem. Can we remove this demo, and then also move demo/nls/cahn-hilliard to demo/pde/cahn-hilliard ? -- Anders
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